Fuel injection pump

Abstract

A fuel injection pump in which the beginning of the fuel injection is set to "early" during the warming-up of the engine by means of an adjustable piston. The adjustment occurs by shifting the adjustable piston by a control member acting through an adjusting member.

What is claimed is: 
     
       1. In a fuel injection pump for an internal combustion engine including: a housing; at least one pump piston in said housing; a cam drive arranged in the housing to produce the fuel feeding stroke of the at least one pump piston; means producing a return force; and an adjustable piston connected to the return force producing means and to the cam drive, said cam drive including a rotatable part, with said cam drive being rotatable relative to the direction of rotation of the rotatable part for adjusting the timing of the beginning of the fuel injection by means of the adjustable piston which is acted upon by an rpm-dependent pressure against the return force of the return force producing means, the improvement comprising a control unit mounted to said housing for directly engaging the adjustable piston, said control unit comprising: an adjustable stop member directly engageable with the adjustable piston;   a temperature sensitive device acting on the adjustable stop member;   further means for producing a return force; and   a mounting structure in which the temperature sensitive device and the further means are mounted, said temperature sensitive device and said further means being operatively interposed between said adjustable stop member and said mounting structure, whereby from engine starting to engine warm-up, the temperature sensitive device varies the position of the adjustable stop member and consequently the adjustable piston in a direction to advance the beginning point of injection.   
     
     
       2. The fuel injection pump as defined in claim 1, said mounting structure further comprising: a stop plate engageable with the adjustable piston to define an original position of the adjustable piston, said stop plate also serving as a support for the operation of the temperature sensitive device and the adjustable stop member.   
     
     
       3. The fuel injection pump as defined in claim 1, wherein the temperature sensitive device comprises a coolant heated thermostat. 
     
     
       4. The fuel injection pump as defined in claim 1, wherein the temperature sensitive device comprises an extensible thermostat.